SQL Server 2000 Stored Procedure & XML Programming in .NET

Creating Data Matrix in .NET SQL Server 2000 Stored Procedure & XML Programming

SQL Server 2000 Stored Procedure & XML Programming
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<attribute type="FirstName"/> <attribute type="LastName"/> <attribute type="Phone"/> <attribute type="Fax"/> <attribute type="Email"/> <attribute type="OrgUnitId"/> <attribute type="UserName"/> <attribute type="ts"/> </ElementType> <ElementType name="Inventory" content="empty" model="closed"> <AttributeType name="Inventoryid" dt:type="i4"/> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="LocationId" dt:type="i4"/> <AttributeType name="StatusId" dt:type="ui1"/> <AttributeType name="LeaseId" dt:type="i4"/> <AttributeType name="LeaseScheduleId" dt:type="i4"/> <AttributeType name="OwnerId" dt:type="i4"/> <AttributeType name="Rent" dt:type="fixed.14.4"/> <AttributeType name="Lease" dt:type="fixed.14.4"/> <AttributeType name="Cost" dt:type="fixed.14.4"/> <AttributeType name="AcquisitionTypeID" dt:type="ui1"/> <attribute type="Inventoryid"/> <attribute type="EquipmentId"/> <attribute type="LocationId"/> <attribute type="StatusId"/> <attribute type="LeaseId"/> <attribute type="LeaseScheduleId"/> <attribute type="OwnerId"/> <attribute type="Rent"/> <attribute type="Lease"/> <attribute type="Cost"/> <attribute type="AcquisitionTypeID"/> </ElementType> </Schema>
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It can be used through the following template:
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<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="OwnerSchema.xml"> Contact </sql:xpath-query> </ROOT>
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The result is shown in Figure 14-20. Naturally, you can join more than two tables.
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14: Publishing Information Using SQLXML
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Figure 14-20
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Relationship as an annotation of an XDR schema
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Other Annotations
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There are other annotations that you can also use in mapping schemas: sql:isconstant="1" annotations are used on static nodes such as the root node; id, idref, and idrefs attributes can be used to create intradocument links in XML documents; sql:id-prefix annotations can be used to make ID attributes unique; sql:use-cdate annotations can be used to specify a CDATA section in the XML document; sql:overflow-field attributes are used to retrieve data from fields that contain XML tags; sql:map-field attributes are used to prevent nodes from being mapped in the schema; and so on.
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Retrieving Data Using XDR Schemas
There are many ways to retrieve database information using XDR annotated schemas, including: Templates that contain XPath queries Templates with inline mapping schemas
SQL Server 2000 Stored Procedure & XML Programming
A URL that refers to the mapping schema and specifies an XPath query Applications that refer to mapping schemas and use XPath queries So far, all examples have used the first method templates that contain XPath queries. We will now explore the next two. The last method is covered in the Programmatic Database Access section later in this chapter.
Templates with Inline Mapping Schemas
It is very simple to create this type of template. The following example merges template and schema files used earlier into one file:
<ROOT xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <Schema name="Schema" sql:id="InlineSchema" sql:is-mapping-schema="1"> <ElementType name="Part" sql:relation="Equipment" content="empty" model="closed"> <AttributeType name="PartNum" dt:type="i4" /> <AttributeType name="Manufacturer" dt:type="string" /> <AttributeType name="Model" dt:type="string"/> <attribute type="PartNum" sql:field="EquipmentId"/> <attribute type="Manufacturer" sql:field="Make"/> <attribute type="Model"/> </ElementType> </Schema> <sql:xpath-query mapping-schema="#InlineSchema"> Part </sql:xpath-query> </ROOT>
The schema is identified using the sql:id attribute and described using the sql:is-mapping-schema attribute of the Schema element. The identifier is used later in the mapping-schema attribute of the sql:xpath-query element. The template can be used with a simple URL reference to the file, as shown in Figure 14-21.
14: Publishing Information Using SQLXML
Figure 14-21
Using a template with an inline mapping schema
A URL with a Reference to a Mapping Schema and an XPath Query
To refer to an XDR-annotated schema in a URL, you must first create a virtual name for the schema of the type described in Configuring Database Access Through HTTP, earlier in this chapter. Such a URL has the following structure:
http://server/virtual_directory/virtual_name/schema_file/XPath_query
The following schema joins three tables (Inventory, Equipment, and EqType). They are related using the <sql:relationship> tag.
<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:xml-sql">
SQL Server 2000 Stored Procedure & XML Programming
<ElementType name="Inventory" content="eltOnly" model="closed" order="many"> <element type="Equipment" maxOccurs="*"> <sql:relationship key-relation="Inventory" key="EquipmentId" foreign-key="EquipmentId" foreign-relation="Equipment" /> </element> <AttributeType name="Inventoryid" dt:type="i4"/> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="LocationId" dt:type="i4"/> <AttributeType name="StatusId" dt:type="ui1"/> <AttributeType name="LeaseId" dt:type="i4"/> <AttributeType name="LeaseScheduleId" dt:type="i4"/> <AttributeType name="OwnerId" dt:type="i4"/> <AttributeType name="Rent" dt:type="fixed.14.4"/> <AttributeType name="Lease" dt:type="fixed.14.4"/> <AttributeType name="Cost" dt:type="fixed.14.4"/> <AttributeType name="AcquisitionTypeID" dt:type="ui1"/> <attribute type="Inventoryid"/> <attribute type="EquipmentId"/> <attribute type="LocationId"/> <attribute type="StatusId"/> <attribute type="LeaseId"/> <attribute type="LeaseScheduleId"/> <attribute type="OwnerId"/> <attribute type="Rent"/> <attribute type="Lease"/> <attribute type="Cost"/> <attribute type="AcquisitionTypeID"/> </ElementType> <ElementType name="Equipment" content="eltOnly" model="closed" order="many"> <element type="EqType" maxOccurs="*"> <sql:relationship key-relation="Equipment" key="EqTypeId" foreign-key="EqTypeId" foreign-relation="EqType" />
14: Publishing Information Using SQLXML
</element> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="Make" dt:type="string"/> <AttributeType name="Model" dt:type="string"/> <AttributeType name="EqTypeId" dt:type="i2"/> <AttributeType name="ModelSDX" dt:type="string"/> <AttributeType name="MakeSDX" dt:type="string"/> <attribute type="EquipmentId"/> <attribute type="Make"/> <attribute type="Model"/> <attribute type="EqTypeId"/> <attribute type="ModelSDX"/> <attribute type="MakeSDX"/> </ElementType> <ElementType name="EqType" content="empty" model="closed"> <AttributeType name="EqTypeId" dt:type="i2"/> <AttributeType name="EqType" dt:type="string"/> <attribute type="EqTypeId"/> <attribute type="EqType"/> </ElementType> <ElementType name="ROOT" sql:is-constant="1"> <element type="Inventory"/> </ElementType> </Schema>
In the preceding examples with template files, it was not necessary to define a unique root element in the schema. The template took care of that requirement. In this case, you have to define the root element explicitly in the XML schema:
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